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[PrintAsObjC] Hack: Assume all option sets have typedefs. #3961

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  • Explanation: PrintAsObjC isn't emitting the correct use of NS_OPTIONS enums that are imported as members because it doesn't think they have same-name typedefs. Hack around this for now by assuming all option-set enums have typedefs. This won't be correct in the long term but it is for now.
  • Scope: Any NS_OPTIONS types that are imported as member types and used then in Swift in @objc members that get printed in the generated header. (There's no workaround besides @nonobjc or passing the raw value.)
  • Issue: rdar://problem/27130343
  • Reviewed by: @milseman
  • Risk: Low.
  • Testing: Added a compiler regression test for all sorts of enums imported as members, and retested the original case reported in the Radar (Foundation's Stream.Event).

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…3851)

...because otherwise option sets that get imported as members using
NS_SWIFT_NAME are printed with an 'enum' tag, and the definition of
NS_OPTIONS only declares the typedef under C++.

We should come back and figure out something more principled for this
later, but for now this solves an issue with generated headers
imported into C++ translation units.

rdar://problem/27130343
(cherry picked from commit 02d2517)
@jrose-apple jrose-apple added this to the Swift 3.0 milestone Aug 3, 2016
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@swift-ci Please test

@jrose-apple jrose-apple merged commit f395524 into swiftlang:swift-3.0-branch Aug 3, 2016
@jrose-apple jrose-apple deleted the swift-3-typedef-is-not-an-option branch August 3, 2016 23:50
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